Okay so, I'm really confused. I don't know what the question is asking me to do... One of them is says "Fifteen times a number is decreased by fifteen. This result is then increased by two times the number. The result is negative 5 times the original number minus the opposite of ten" I'm so lost! Help please

## Translating Algebraic Expressions?

# 1 Answer

Break it down piece by piece and write as you do. Here, like this:

"Fifteen times a number"

Ok, I'll call my number Q, just because I'm tired of X. So, I write 15Q, because that's "fifteen times a number". Next:

"decreased by fifteen." Um, ok.

15Q **- 15** (right? You see what I did there?)

"This result is then increased"

15Q - 15 **+**

"by two times the number."

15Q - 15 + **2Q**

Now here it gets a little wonky. I'm interpreting it like so:

"The result is"

15Q - 15 + 2Q **=** (So, I'm seeing this as building an equation)

"negative 5 times the original number"

15Q - 15 + 2Q = **-5Q**

"minus the opposite of ten"

Here, recall that "opposite" simply refers to the one on the other side of 0. So the opposite of 10 is -10. The opposite of -4 is 4. So watch closely:

15Q - 15 + 2Q = -5Q **- (-10)**

From here, you can solve for Q on your own. :)

Hope this helps!